Gas-engine.



E. A. NELSON.

GAS ENGINE. APPLICATION FILED 3111224, 1905 'w @4406 Man,

# aw/7%, @M MMQ Patented Nov. 24, 1908.

2 SHEETS-SHEET 1.

B. A. NELSON.

GAS ENGIIE. APPLIOATIOI mum JAI. a,

Patented Nov. 24, 1908.

2 SHEETS-SHEET '2.

attozwu a UNITED STATES PATENT OFFICE.-

'EMIL A. NELSON, or DETROIT, MICHIGAN, ASSIGNOR 'ro WILLIAM J. NEWTON AND CHAR-LES;

T. WOODALL, OF DETROIT,-MIGHIGAN.

GAS-ENGINE.

Specification of Letters Patent.

Patented Nov. 24, 1908.

Application mm January. 2;, ieoe. Serial No. 297,624.

To all whom it mayconcem:

Be it known that= I,'E1\rI A. NELSON, a citizen of the United States, residing at' Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Gas Engines, of WhlCh the following is a specification.

This invention relates to gas engines and' 2, a transverse section on the line 22, Fig.

'1; Fig. 3, a plan of Fig. 2.

The multiple piston engine is shown as constructed to receive two pistons A in line with each other and reciprocating. to and from each other in a'single continuous cylinder B. The two crank shafts C 0, parallel to each other, are each geared by bevel gears D with the cam shaft E. A casing K con nected with the cylinders and formin prac-.

tically part thereof, incloses the beve ears and the crank parts of the shafts, an has bearings for the crank shafts and cam shaft -'as shown, so as to protect the parts and to constitute an oil chamber for lubricating the.

cranks, pistons and gears. The shafts may be provided with any suitable bearings, roller bearingsbeing shown. The centerof the cylinder B constitutes the explosion chamber when the ignited gases actto carry the pistons simultaneously outward, the ignition being 'efi'ected b any suitable igniting (i being shown.

While different valve arrangements may be used to control the supply and discharge of gases, according as the engine operates as va two-cycle or four-cycle engine, as shown the engine operates on a four cycle, and there are two, ports 2, 3, at' the center of the cylinder closed by valves 4., 5, each opening downward The port 2 is the inlet ort, to

which the gaseous mixture is supplie in any suitable manner, and the port 3 is the exhaust port and communicates with the exhaust pipes 45. 'lfizeferabl the cylinder B municating with a section. of

has at the centerfiasboxike extension 6' which projects to one side and is there divided into two chambers :12, 3 the former communicating with the charge inlet Eipe7, and the latter with two side port's comeac the; exhaust I pipe 45,- so that the exhaust can escape freely and in opposite directions avoidin any possible back pressure. At the opposite side of the box 6 are two openings to, each threaded to receive a threaded cap31. This permits the introduction of tools to grind the valve seats, and access to the box to insert and remove the valves.

The valve stems 8, 9 extend through suitable packing boxes and project beyond the wall of the extension 6,v and each carries a disk 10 between which and the wall of the extension 6 is compressed a spring 12 which thus tends'to hold the valve to its seat; -The valves are operated from the cam shaftby suitable devices. As shown, a vibrat" rocklever H is pivoted to a bracket 14 extends across the end of both valve stems, carrying adjustable contact pieces 15, 16,

, osite a cam 19 on the cam shaft, the cam iaving a'grooved face adapted to the ball;-

thus securlng a greater bearing surface and reducing wear. Preferably, the ball 18 is in a block 23 having a threaded socket to receive the threaded end of the rod 17 so that by turning the block, the distance .between the ball andthe end of the lever H may be varied and the block is held from further r0,- tation and is guided by means of a cross pin 24, extending through the block and projecting at the ends into longitudinal slots '0 of a hollow neck 21 extending from the easing. Upon the neck 21 is a bearing rin 25 between which and a disk 22 on the}. 17 intervenes a spring 20 which tends to hold the ball 18 against the cam and is strong enough to overcome the resistance of the inlet spring 12. When the cam 19 moves from the position, Fig. 2, the rod 17 moves inward, rocks the lever H and opens the inlet valve, supplying a charge to the cylinder. M the point 28 of the cam passes the'ball 18, the cam begins to force out the rod 17 and the inlet valve closes and remains closed as the pistons come togetherand compress the charge. As the pistons reach their outward osition, the part 29 of the cam passes the ba 1 18 and the rod 17 is quickly carried out until the ball rests on the face 30, -the lever H beingthus rocked to force inward the valve stem 9 and open the exhaust valve and hold it open while the pistons move inward. The control of the gases isthus effected by means of two valves and a single cam.

vThe cam shaft E may carry at 33 commutator of any suitable character and may be rotated from a suitable hand crank, not shown, to start the engine. The cylinder has cooling ribs or projections 34; and may be cooled in any suitable manner, an air cooler being shown. A light casing M incloses the cylinder and is also formed to constitute the casing of a rotary blower or fan 35, the casing having side inlets u and a discharge opening 25, so that the air received by the blower is forcibly directed around the cylinder' and outward. The blower is driven from the engine, as for instance, by means of friction fly wheels 37 carried by the crank shafts and drivingfriction pulleys 38 on the shaft 39 of the blower. The pulleys are adjustably secured to the shaft 39 by set screws 40 so that they can be set inward to-, ward the centers of the wheels 37 when it is desired to reduce the speed of the blower in cold weather. Any other suitable means of varying the speed of the blower may be used.

It will be noted that the air blast is di rected to the center of the cylinder 13, and as there is but a single explosion point to both parts of the cylinder, the latter can be better cooled than when two cylinders, each with an explosion chamber at one end are used. Thepower of the engine may be transmitted to the part or parts to be driven from the friction wheels 36, 36, or-in any other suitable manner. a

Vtithout limiting myself to the construction shown, I claim 1. The combination with the cylinder and pistons of a gas engine, of oppositely arranged parallel crank shafts, a shaft E p. allel to the cylinder and operatively connected with the crank shafts, inlet and outlet valves, means for actuating said valves from said shaft E, a casing inclosing both he crank shaftand gears at each end of the cylinder and also communicating with the latter, substantially as set forth.

2. In a gas engine having a cylinder, and pistons reciprocating to and from each othe therein, a box-like central extension of said cylinder provided with inlet and outlet ports, valves adapted thereto, and valve actuating means, substantially as set forth.

3. In a gas engine having a cylinder, and pistons reciprocating to and from each other therein, a box-like central extension of said cylinder provided with inlet and outlet ports, valves adapted thereto. valve aetuating means, and openings in said extension opposite said ports and provided with detachable caps, substantially as se forth.

4. The combination in a gas engine, ef a cylinder, inlet and outlet valves, a caral box-like extension of the cylinder di ed beyond said valves into two chambers, and inlet and outlet ports in the'sides of said extension, substantially as set forth.

In testimony whereof I affix my signature in presence of two witnesses.

Eit iiL A. l LSUrT.

Vi itnesses Bnnc'r. G. Gus'rarsson, EDUARD C. MITCHELL.

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